Answer by Kellycheeseburger10. Confidence votes 86. When a light is shined into an eye the pupil contracts gets smaller because the eye doesn't need all the light being presented to it. If the light is taken away the pupil dilates. PS like the eye gets bigger in the dark.
The ancient Egyptians did not know the hard setting lime plaster invented by the Greeks, but used instead a mixture of gypsum and quartz with small amounts of lime [5] when working with stone.This was not as disastrous in the dry climate of Egypt as it would have been under wetter conditions.ost of the ancient Egyptian buildings have disappeared leaving no trace. Built of sun baked bricks made of Nile mud and straw, houses, palaces and city walls crumbled when they stopped being looked after.
Plaster of Paris is made up from gypsum. This has been used from the ancient times. Plaster of Paris got its name because earlier it was used near Paris, to make plaster and cement. They also used it to do ornamental work on ceilings and cornices. Plaster of Paris is made from Gypsum. â¢ Gypsum contains calcium sulfate dihydrate (CaSO 4 Â·2H 2 O) and plaster of Paris contains calcium sulfate hemihydrates (CaSO 4 Â·0.5H 2 O). â¢ When added water to plaster of Paris, it will re-form into gypsum.